Mayweather vs Berto prediction: Who is winning the fight tonight ... and how?

The end of an era?

After 19 years of dominance, Floyd Mayweather's career will ostensibly come to an end TONIGHT (Sat., Sept. 12, 2015) when "Money" takes on the powerful Andre Berto in the main event of a four-fight card at MGM Grand Garden Arena in Las Vegas, Nevada.

MMAmania will deliver LIVE coverage of "Mayweather vs. Berto" later this evening, starting with the Showtime pay-per-view (PPV) broadcast at 8 p.m. ET.

Elsewhere on the main card, newly-crowned 168-pound champion Badou Jack makes his first title defense against English powerhouse George Groves, Super Featherweight bruisers Roman Martinez and Orlando Salido duke it out for a second time, and veteran puncher Jhonny Gonzalez faces Jonathan Oquendo to open proceedings.